91 lines
2.3 KiB
TypeScript
91 lines
2.3 KiB
TypeScript
export const byteToStr = (v: number) => String.fromCharCode((v & 0xF) + 97, ((v >> 4) & 0xF) + 97)
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export const wordToStr = (v: number) => byteToStr(v & 0xFF) + byteToStr((v >> 8) & 0xFF)
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// Waveshare 7.5 V2, derived from original source code
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export const DisplayCode = `EPD${String.fromCharCode(22 + 97)}_`
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type Pixel = 0 | 1 | 2 | 3 // monochrome ePaper display
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export function getPixelValue (bitmap: Uint8ClampedArray, index: number): Pixel {
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const px = bitmap[index]
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const px2 = bitmap[index + 1]
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if (px === px2) {
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if (px === 0x00) return 0
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if (px === 0xFF) return 1
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if (px === 0x7F) return 2
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}
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return 3
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}
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function getImageData (bitmap: Uint8ClampedArray, width: number, height: number): Pixel[] {
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const imageData = Array(width * height) as Pixel[]
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let i = 0
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for (let y = 0; y < height; y++) {
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for (let x = 0; x < width; x++, i++) {
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imageData[i] = getPixelValue(bitmap, i << 2)
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}
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}
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return imageData
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}
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export default function initializeTransmitter (ip: string) {
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const POST_URL = `http://${ip}/`
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let stIndex = 0 // some index
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let pxIndex = 0 // pixel value index
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let rqMsg = '' // message sent to server
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let imageData: Pixel[]
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let dataLen: number
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async function u_send (cmd: string, next: boolean) {
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try {
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await fetch(`${POST_URL}${cmd}`, {
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method: 'POST',
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body: '',
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})
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} catch {
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/* ignore errors */
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} finally {
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if (stIndex === 0) u_data()
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else if (stIndex === 1) u_done()
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}
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if (next) stIndex++
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}
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function u_done () {
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console.log('Transfer Complete!')
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u_send('SHOW_', true)
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}
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function u_show () {
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const percentage = pxIndex / dataLen * 100
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console.log(`Transfer: ${pxIndex}/${dataLen} (${Math.round(percentage)}%)`)
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const cmd = `${rqMsg}${wordToStr(rqMsg.length)}LOAD_`
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u_send(cmd, pxIndex >= dataLen)
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}
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function u_data () {
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rqMsg = ""
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while ((pxIndex < dataLen) && (rqMsg.length < 1000)) {
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let v = 0;
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for (let i = 0; i < 8; i++) {
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if ((pxIndex < dataLen) && imageData[pxIndex++]) v |= 128 >> i
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}
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rqMsg += byteToStr(v)
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}
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u_show()
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}
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return function uploadImage (bitmap: Uint8ClampedArray, width: number, height: number) {
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imageData = getImageData(bitmap, width, height)
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dataLen = imageData.length
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u_send(DisplayCode, false);
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}
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}
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